14 Entomobryidae 



ISOTOMA Bourlet 



I. besselsi Pck. LI: Cold Sp. Harb., Jl, CB Davenport. Strictly littoral; on sea- 

 shore between tide marks ; probably distributed by marine currents. Generally 

 distributed : Finland ; Norway ; England ; Scotland ; Greenland ; Spitzbergen ; 

 Nova Zembla, etc.; Tierra del Fuego; Mass, NY, Calif. 



I. schafferi Krausbauer. Voorheesville, Nov, Leon. Generally distributed : Europe ; 

 NY, Mass. 



I. minuta Tull. Westport, May, FCSmith, "in hotbeds in large numbers" ; Red 

 Hook, Je (Felt) ; Nassau Co, Ap, Cy, "in greenhouse in masses." A soil 

 species ; minute, but sometimes occurring in masses in immense numbers. 

 Generally distributed: Europe; Canada; Mass, Conn, NY, Penn, Ga, 111, la, 

 Kans, Tex. 



I. immersa Fols. LI: found in enormous numbers in a mushroom cellar (Lint). 

 Generally distributed: NY. 



I. albella Pck. Potsdam, May, Yg; Wells, Jl, Yg; Geneva, Jl, HGlasgow; 

 Albany, Feb, from a filter of city water (Lint). 



I. walkeri Pck. (leonina Pck.). Macedon, Ap, Hd; Ithaca (MacG). Common in 

 colonies under recently loosened bark of trees or logs. Generally distributed : 

 Mass, NY, Penn, Ohio, 111, la, Minn; Canada. 



I. olivacea Tull. Albany, May, 7, 1924, Yg. Generally distributed: Northern 

 Europe; Greenland; Canada; NY. 



I. cinerea Nic. (MacGillivray's unica, dilatata, inclinata, and lateraria). Macedon, 

 Ap-May, Hd; Ithaca (MacG) ; Albany, May, Yg. -Abundant in colonies 

 under recently loosened bark of trees and logs. Generally distributed : Europe ; 

 Siberia ; Franz Josef Land ; Canada ; Me, Mass, NY, Ohio, 111. 



I. arborea L., Agren. (MacGillivray's synonymica and terminata). Potsdam, 

 May, Yg; Macedon, Ap-May, Hd; Ithaca, Feb-Mar (MacG), Mar, 

 Dobroscky (Fols). Generally distributed: Northern Europe; Me, Mass, 

 NY, Ohio, 111. 



I. arborea var. nigra MacG. (nigra, hrimnea, and speciosa). Ithaca, Mar, 1890 

 (MacG). Generally distributed: Me, Mass, NY, Ohio, 111, Minn; Canada. 



I. viridis Bourlet (Packard's glauca and plumhea). Potsdam, May, Yg; Macedon, 

 Ap, Hd; Ithaca, Sep (MacG) ; McLean Bogs, Ap, Cy; Albany, Je, Yg; LI, 

 Bks. Abundant in soil, under wood, stones, etc. ; the largest species of its 

 genus in NA and Europe, and easily seen with the naked eye. Generally 

 distributed: Europe; Arctic islands; Canada; Me, NH, Mass, NY, DC, 

 Ohio, 111, Tenn, la, Tex, Minn, Colo, Calif, Wash, Alaska. 



I. viridis var. riparia Nic. Mt. Mclntyre, 4000-5000 ft., Jl, Leon; Ithaca, Feb-Mar 

 (MacG) ; LI, Dec, Bks. Generally distributed: Europe; Siberia; Canada; 

 NY, NH, Va, la, Tex, Calif. 



ISOTOMURUS Borner 



I. palustris Miiller (aequalis MacG.). Sodus Pt., Je, Hd; Ithaca, May-Je, Oct, 

 RubyB Hughes; Voorheesville, Aug, Leon; Pine Plains, Je, Yg; LI: Great 

 Pond, Riverhead, May, BisJi. A common species on the surface of pools and 

 streams ; varies greatly in coloration. Generally distributed : Europe ; Green- 

 land; Canada; Cuba; Me, Mass, NY, Md, Ga, Ohio, 111, la. Wis, Tenn, Tex, 

 Minn, Calif. 



